NdNbO4–xCuO (x = 0, 0·15, 0·2, 0·3, 0·4, 0·5, 1 wt-%) ceramics with improved sintering characteristic and microwave dielectric properties were prepared by conventional mixed oxide route. The effects of CuO addition on the microstructures and microwave dielectric properties of NdNbO4 ceramics were investigated systematically. Microscopic analysis showed that CuO doped NdNbO4 ceramics possess second phases of CuNb2O6 and Nd2Cu2O5. With a further increase in the amount of CuO, Cu3Nb2O8 phase appeared in the system. The addition of CuO effectively reduced the sintering temperature of NdNbO4 ceramics by ∼275°C. The microwave dielectric properties were strongly dependent on the CuO addition. Optimal microwave dielectric properties of ϵr = 19·76, τƒ = −24 ppm °C−1 and Q׃ = 39 000 GHz were observed for 0·2 wt-%CuO doped NdNbO4 ceramics sintered at 975°C for 4 h.

文章链接：1-Improved sintering characteristics and microwave dielectric properties of NdNbO4 ceramic system.pdf